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University of Economics, Prague
(14 results)-
White Papers
Case Study on Linked Data and SPARQL Usage for Web Application Development
December 7, 2009, 12:00am PST
Most current websites are programmed to be human-readable only. Even if the websites are dynamically generated, all semantics of presented data is lost as they are published as (X)HTML pages....
Provided by University of Economics, Prague
-
Whitepapers
Free Distance Bounds for Protograph-Based Regular LDPC Convolutional Codes
April 28, 2008, 12:00am PDT
In this paper asymptotic methods are used to form lower bounds on the free distance to constraint length ratio of several ensembles of regular, asymptotically good, protograph based LDPC...
Provided by University of Economics, Prague
-
Whitepapers
A New Method of Encoding Block Codes With Polynomials
January 1, 2012, 12:00am PST
The authors present an efficient new method of obtaining a generator matrix G from certain types of parity check matrices H with a defective cyclic block structure. This novel approach describes...
Provided by University of Economics, Prague
-
Whitepapers
Asymptotically Good LDPC Convolutional Codes Based on Protographs
May 2, 2008, 12:00am PDT
LDPC convolutional codes have been shown to be capable of achieving the same capacity-approaching performance as LDPC block codes with iterative message-passing decoding. In this paper, asymptotic...
Provided by University of Economics, Prague
-
Whitepapers
Performance Evaluation and Energy Efficiency of Random Network Coding in LTE-Advanced
May 24, 2012, 12:00am PDT
In this paper, the authors propose integration of Random Network Coding (R-NC) sublayer at the Radio Link Control/Multiple Access Control (RLC/MAC) layer boundary within the 3GPP Long Term...
Provided by University of Economics, Prague
-
Whitepapers
Robust SLNR Downlink Beamforming Based on Markov's Inequality
May 24, 2012, 12:00am PDT
This paper considers the Multi-User Multiple-Input and Multiple-Output (MU-MIMO) downlink system where each user is equipped with multiple receive antennas. Due to the inevitable channel...
Provided by University of Economics, Prague
-
Whitepapers
Coded Spatial Modulation Applied to Optical Wireless Communications in Indoor Environments
March 12, 2012, 12:00am PDT
Spatial Modulation (SM) is a combined Multiple-Input-Multiple-Output (MIMO) and digital modulation technique which besides common signal modulation conveys additional information bits in the...
Provided by University of Economics, Prague
-
Whitepapers
An Ehrenfeucht-Fraisse Game Approach to Collapse Results in Database Theory
February 1, 2008, 12:00am PST
The authors present a new Ehrenfeucht-Fraisse game approach to collapse results in database theory. They show that, in principle, every natural generic collapse result may be proved via a...
Provided by University of Economics, Prague
-
Whitepapers
Parallel Coordinate Descent Methods for Big Data Optimization
December 4, 2012, 12:00am PST
In this paper, the authors show that randomized (block) coordinate descent methods can be accelerated by parallelization when applied to the problem of minimizing the sum of a partially separable...
Provided by University of Economics, Prague
-
Whitepapers
Energy-Efficient Subcarrier-and-Bit Allocation in Multi-User OFDMA Systems
February 6, 2012, 12:00am PST
Energy efficiency is becoming increasingly important for wireless communication systems in order to minimize carbon footprint of wireless networks and to increase the battery life of mobile...
Provided by University of Economics, Prague
-
Whitepapers
Spectral-Energy Efficiency Tradeoff in Cognitive Radio Networks With Peak Interference Power Constraints
August 6, 2011, 12:00am PDT
Cognitive Radio (CR) is considered as one of the prominent techniques to improve the spectrum utilization by opportunistically sharing the radio spectrum resources with licensed users. This paper...
Provided by University of Economics, Prague
-
Whitepapers
Energy Efficient Resource Allocation in OFDMA Networks Using Ant-Colony Optimization
July 17, 2012, 12:00am PDT
A novel technique for jointly allocating sub-carriers, Modulation and Coding Scheme (MCS) and transmit power in an Orthogonal Frequency Division Multiple Access (OFDMA) cellular network using...
Provided by University of Economics, Prague
-
Whitepapers
Evaluating Speech Intelligibility Enhancement for HMM-Based Synthetic Speech in Noise
June 29, 2012, 12:00am PDT
It is possible to increase the intelligibility of speech in noise by enhancing the clean speech signal. In this paper, the authors demonstrate the effects of modifying the spectral envelope of...
Provided by University of Economics, Prague
-
Whitepapers
Word Storms: Multiples of Word Clouds for Visual Comparison of Documents
January 3, 2013, 12:00am PST
Word clouds are a popular tool for visualizing documents, but they are not a good tool for comparing documents, because identical words are not presented consistently across different clouds. The...
Provided by University of Economics, Prague
-
Whitepapers
Word Storms: Multiples of Word Clouds for Visual Comparison of Documents
January 3, 2013, 12:00am PST
Word clouds are a popular tool for visualizing documents, but they are not a good tool for comparing documents, because identical words are not presented consistently across different clouds. The...
Provided by University of Economics, Prague
-
Whitepapers
Evaluating Speech Intelligibility Enhancement for HMM-Based Synthetic Speech in Noise
June 29, 2012, 12:00am PDT
It is possible to increase the intelligibility of speech in noise by enhancing the clean speech signal. In this paper, the authors demonstrate the effects of modifying the spectral envelope of...
Provided by University of Economics, Prague
-
Whitepapers
Energy Efficient Resource Allocation in OFDMA Networks Using Ant-Colony Optimization
July 17, 2012, 12:00am PDT
A novel technique for jointly allocating sub-carriers, Modulation and Coding Scheme (MCS) and transmit power in an Orthogonal Frequency Division Multiple Access (OFDMA) cellular network using...
Provided by University of Economics, Prague
-
Whitepapers
Spectral-Energy Efficiency Tradeoff in Cognitive Radio Networks With Peak Interference Power Constraints
August 6, 2011, 12:00am PDT
Cognitive Radio (CR) is considered as one of the prominent techniques to improve the spectrum utilization by opportunistically sharing the radio spectrum resources with licensed users. This paper...
Provided by University of Economics, Prague
-
Whitepapers
Energy-Efficient Subcarrier-and-Bit Allocation in Multi-User OFDMA Systems
February 6, 2012, 12:00am PST
Energy efficiency is becoming increasingly important for wireless communication systems in order to minimize carbon footprint of wireless networks and to increase the battery life of mobile...
Provided by University of Economics, Prague
-
Whitepapers
Parallel Coordinate Descent Methods for Big Data Optimization
December 4, 2012, 12:00am PST
In this paper, the authors show that randomized (block) coordinate descent methods can be accelerated by parallelization when applied to the problem of minimizing the sum of a partially separable...
Provided by University of Economics, Prague
-
Whitepapers
An Ehrenfeucht-Fraisse Game Approach to Collapse Results in Database Theory
February 1, 2008, 12:00am PST
The authors present a new Ehrenfeucht-Fraisse game approach to collapse results in database theory. They show that, in principle, every natural generic collapse result may be proved via a...
Provided by University of Economics, Prague
-
Whitepapers
Coded Spatial Modulation Applied to Optical Wireless Communications in Indoor Environments
March 12, 2012, 12:00am PDT
Spatial Modulation (SM) is a combined Multiple-Input-Multiple-Output (MIMO) and digital modulation technique which besides common signal modulation conveys additional information bits in the...
Provided by University of Economics, Prague
-
Whitepapers
Robust SLNR Downlink Beamforming Based on Markov's Inequality
May 24, 2012, 12:00am PDT
This paper considers the Multi-User Multiple-Input and Multiple-Output (MU-MIMO) downlink system where each user is equipped with multiple receive antennas. Due to the inevitable channel...
Provided by University of Economics, Prague
-
Whitepapers
Performance Evaluation and Energy Efficiency of Random Network Coding in LTE-Advanced
May 24, 2012, 12:00am PDT
In this paper, the authors propose integration of Random Network Coding (R-NC) sublayer at the Radio Link Control/Multiple Access Control (RLC/MAC) layer boundary within the 3GPP Long Term...
Provided by University of Economics, Prague
-
Whitepapers
Asymptotically Good LDPC Convolutional Codes Based on Protographs
May 2, 2008, 12:00am PDT
LDPC convolutional codes have been shown to be capable of achieving the same capacity-approaching performance as LDPC block codes with iterative message-passing decoding. In this paper, asymptotic...
Provided by University of Economics, Prague
-
Whitepapers
A New Method of Encoding Block Codes With Polynomials
January 1, 2012, 12:00am PST
The authors present an efficient new method of obtaining a generator matrix G from certain types of parity check matrices H with a defective cyclic block structure. This novel approach describes...
Provided by University of Economics, Prague
-
Whitepapers
Free Distance Bounds for Protograph-Based Regular LDPC Convolutional Codes
April 28, 2008, 12:00am PDT
In this paper asymptotic methods are used to form lower bounds on the free distance to constraint length ratio of several ensembles of regular, asymptotically good, protograph based LDPC...
Provided by University of Economics, Prague
-
White Papers
Case Study on Linked Data and SPARQL Usage for Web Application Development
December 7, 2009, 12:00am PST
Most current websites are programmed to be human-readable only. Even if the websites are dynamically generated, all semantics of presented data is lost as they are published as (X)HTML pages....
Provided by University of Economics, Prague
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